Servo and set up help

[mark68]

Can I run this by you, I've just converted a cnc router to UCCNC from a chinese controller which I believe was using 320khz kernal frequency.

I'm looking for rapids around 40mtrs min and as such have had to currently set the kernal frequency to 400khz to achieve this because I believe of what my steps per unit is set at,see below for my settings. My question is would you leave all my settings as they are or would there be a better recomendation and if so can you explain why. I've not had a machine with servos until now so still learning.

I have Leadshine 80mm 750W AC220V Servo Motors model ACM2-08008H2F1-E23-65 2.4NM 23 Bit Encoders 3000rpm with Leadshine L7-750 Servo Motor Drivers on

X and Y axis which both have steps per set at 469.48 (both these axis are using helical racks with 5:1 gear reduction)
Z axis steps per unit are 2000 this is ball screw driven.

If i reduce the kernal to 200khz then maximum velocity redices to approx 25mtrs/min (units). I understand you can change the servo drives settings to use gearing I believe you call it, is this what would be adjusted to reduce the steps per unit, decrease the kernal speed and in turn achieve 40000 units/min. But is the machine is running fine as it is should i leave it on my current settings?

Lastly my acceleration units are set to 1000,1000,200 for X,Y and Z axis resectively does this seem, fast, slow about correct for a servo driven machine?

[cncdrive]

If he speed of the axes are high enough for your requirements then you can leave the kernel frequency on 200kHz.
The lower the kernel frequency is the better, the operation is safer as the pulses are longer on 200kHz then on 400kHz.

[mark68]

If he speed of the axes are high enough for your requirements then you can leave the kernel frequency on 200kHz.
The lower the kernel frequency is the better, the operation is safer as the pulses are longer on 200kHz then on 400kHz.

The speed of the axis at 200khz restricts me to 25mtrs/min hence why I've had to choose 400khz to achieve 40mtrs/min as there is nothing in between.

Is it better then to leave it on 400khz or lower the frequency as you've stated to 200khz and then use gearing on the servo drives to achive the desired speed?